Analysis of loads in diesel engine cranking mechanism

U ovome radu provedena je analiza opterećenja sila i momenata na spojnim točkama u koljenastom mehanizmu motora marke MAN D 0826 LOH 15. U prvi spojni dio spada klip s malom glavom na klipnjači, a u drugi spojni sklop leteća ili velika glava klipnjače s koljenom koljenastog vratila. Treća točka analize opterećenja na koju djeluju sile nalazi se u središnjoj osi koljenastog vratila ili radilice. U prvom dijelu diplomskog rada opisan je teorijski dio rada koljenastog mehanizma koji je analiziran pomoću kinematike i dinamike. Opisan je uzrok nastajanja i djelovanje sila i momenata na sklop koljenastog mehanizma. Analiza na motoru marke MAN D 0826 LOH 15 provedena je u drugom dijelu ovog diplomskog rada. Proračunom je određen utjecaj sila na izlazni zakretni moment na koljenastom vratilu i izvedeno je uravnoteženje sila na koljenastom mehanizmu u koje spadaju centrifugalne sile i inercijske sile prvoga i drugoga reda. Uravnoteženje je izvršeno dodavanjem protuutega na koljenima radilice. Ta analiza provedena je na motoru sa jednim cilindrom a kasnije na motoru sa šest i 12 cilindara u linijskom rasporedu te na V12-motoru čiji kut između cilindara iznosi 60° i 90°.In this thesis an analysis of the loading forces and momenta on the coupling points in the crankshaft mechanism MAN D 0826 LOH 15 was carried out. In the first coupling part there is a piston with a small end on the connecting rod, and in the second coupling part there is a big end connecting rod with a crankshaft rod journal. The third part of the analysis of the loading, which is influenced by the forces, is in the centerline of the crankshaft. The first part of this thesis explains the crankshaft mechanism, which was analyzed with the help of kinematics and dynamics. The cause and influence of the forces and momenta on the crankshaft composition is described. An analysis of the engine MAN D 0826 LOH 15 was carried out in the second part of this thesis. The influence of the forces on the output torque of the crankshaft was calculated and an engine balance of the crankshaft involving centrifugal as well as primary and secondary inertia forces was carried out. The balance was performed by adding the counterweights onto the crankshaft rod journals. This analysis was firstly conducted on a one cylinder engine, secondly on an inline-six and 12 engine and, finally, on a V12 engine with 60° or 90° angle between cylinders